#include <bits/stdc++.h>
#define LLI long long int
#define FOR(v, a, b) for(LLI v = (a); v < (b); ++v)
#define FORE(v, a, b) for(LLI v = (a); v <= (b); ++v)
#define REP(v, n) FOR(v, 0, n)
#define REPE(v, n) FORE(v, 0, n)
#define REV(v, a, b) for(LLI v = (a); v >= (b); --v)
#define ALL(x) (x).begin(), (x).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define ITR(it, c) for(auto it = (c).begin(); it != (c).end(); ++it)
#define RITR(it, c) for(auto it = (c).rbegin(); it != (c).rend(); ++it)
#define EXIST(c,x) ((c).find(x) != (c).end())
#define fst first
#define snd second
#define popcount __builtin_popcount
#define UNIQ(v) (v).erase(unique(ALL(v)), (v).end())
#define bit(i) (1LL<<(i))

#ifdef DEBUG
#include <misc/C++/Debug.cpp>
#else
#define dump(...) ((void)0)
#endif

#define gcd __gcd

using namespace std;
template <class T> constexpr T lcm(T m, T n){return m/gcd(m,n)*n;}

template <typename I> void join(ostream &ost, I s, I t, string d=" "){for(auto i=s; i!=t; ++i){if(i!=s)ost<<d; ost<<*i;}ost<<endl;}
template <typename T> istream& operator>>(istream &is, vector<T> &v){for(auto &a : v) is >> a; return is;}
template <typename T, typename U> bool chmin(T &a, const U &b){return (a>b ? a=b, true : false);}
template <typename T, typename U> bool chmax(T &a, const U &b){return (a<b ? a=b, true : false);}
template <typename T, size_t N, typename U> void fill_array(T (&a)[N], const U &v){fill((U*)a, (U*)(a+N), v);}

struct Init{
  Init(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(12);
    cerr << fixed << setprecision(12);
  }
}init;


vector<double> quadratic_equation(double a, double b, double c){
  double d = b*b-4*a*c;
  if(d < 0) return {};
  
  double x1 = (-b - sqrt(d))/(2*a);
  double x2 = (-b + sqrt(d))/(2*a);
  return {x1,x2};
}




int main(){
  LLI a,b,c;
  while(cin >> a >> b >> c){

    if(a == 0){
      if(b == 0){
        if(c == 0){
          cout << -1 << endl;
        }else{
          cout << 0 << endl;
        }
      }else{
        cout << 1 << endl;
        cout << (double)c / (-b) << endl;
      }
    }else{
      LLI d = b*b-4*a*c;

      if(d == 0){
        cout << 1 << endl;
        cout << (double)b / (-2*a) << endl;
      }else if(d < 0){
        cout << 0 << endl;
      }else{
        cout << 2 << endl;

        double x = (-(double)b - sqrt(d)) / (2*a);
        double y = (-(double)b + sqrt(d)) / (2*a);

        if(x > y) swap(x, y);
        
        cout << x << endl;
        cout << y << endl;
      }
    }
  }

  return 0;
}